NI myDAQ User Guide - National Instruments
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1. NI myDAQ User Guide National Instruments 19 Function Generator FGEN The NI ELVISmx Function Generator FGEN generates standard waveforms with options for the type of output waveform sine square or triangle amplitude selection and frequency settings In addition the instrument offers DC offset setting frequency sweep capabilities and amplitude and frequency modulation The FGEN uses AO 0 or AO 1 on the screw terminal connector This instrument has the following measurement parameters Output channel AO 0 or AO 1 Frequency range 0 2 Hz to 20 kHz Figure 14 NI ELVISmx Function Generator 13 Function Generator NI ELVISmx m Frequency Amplitude DC Offset e Na 7 z 0 0 10 0 5 0 1 00 19 0 08 V 200m 20k Modulation Type 100 Hz Start Frequency Stop Frequency Step Step Interval 100 0 Hz 1 0k 4 Hz 100 00 Hz 1000 19 ms Device Signal Route Dev1 NI myDAQ 400 M Run Sweep Stop Help lcu La e 20 nicom NI myDAQ User Guide Bode Analyzer The NI ELVISmx Bode Analyzer produces a Bode plot for analysis By combining the frequency sweep feature of the function generator and the analog input capability of the device a full function Bode Analyzer is available with NI ELVISmx You can set the frequency range of the instrument and choose between linear an2. NI myDAQ User Guide Digital Writer The NI ELVISmx Digital Writer updates the NI myDAQ digital lines with user specified digital patterns NI ELVISmx Digital Writer groups the I O lines into ports through which data can be written You can write a 4 bit pattern 0 to 3 or 4 to 7 or an 8 bit pattern 0 to 7 You can also manually create a pattern or select predefined patterns such as ramp toggle or walking 1s This instrument can control a port of four or eight consecutive lines and either continually output a pattern or just perform a single write The output of the NI ELVISmx Digital Writer stays latched until either another pattern is generated the lines it is using are configured for read or the power is cycled on the NI myDAQ Figure 19 NI ELVISmx Digital Writer 2 Digital Writer NI ELVISmx m Lines to Write 4 7 Pattern Manual Manual Pattern Y fx f HI 1000 4 o Lines 7 6 5 4 3 2 1 Action Direction Run Stop Help NI myDAQ User Guide National Instruments 25 Example Measuring a Signal Using the NI ELVISmx Oscilloscope with NI myDAQ Complete the following steps to measure a signal with the NI ELVISmx Scope Note Before opening an NI ELVISmx software instrument make sure that the myDAQ device is connected to the system and is ready to use After the myDAQ is connected to the system the blue LED by the conne
3. Both positive and negative analog input lines require a DC path to ground in order for the instrumentation amplifier to work If the source is AC coupled capacitively coupled a resistor is needed between the positive input and AGND If the source has low impedance choose a resistor that is large enough not to significantly load the source but small enough not to produce significant input offset voltage as a result of input bias current typically 100 kQ to 1 MQ In this case connect the negative input directly to AGND If the source has high output impedance balance the signal path as previously described using the same value resistor on both the positive and negative inputs 12 nicom NImyDAQ User Guide NI myDAQ DMM Fuse Replacement NI myDAQ has a fuse to protect the device from overcurrent through HI A current measurement input on the DMM If the NI ELVISmx DMM software instrument always reads 0 A current the cause may be a blown fuse Testing Your Fuse To test for a blown fuse complete the following steps 1 2 Using a banana cable connect the HI V and HI A DMM terminals Launch the NI ELVISmx Digital Multimeter DMM software instrument from the NI ELVISmx Instrument Launcher located at Start All Programs National Instruments NI ELVISmx for NI ELVIS amp NI myDAQ NI ELVISmx Instrument Launcher Select the Resistance mode by clicking the Resistance button f Click Run If the fuse is blo
4. gm ms ms __ NI ELVISmx jig NI ELVISmx Digital Multimeter Oscilloscope Generator NI myDAQ User Guide National Instruments 27 Example Measuring Signals Using the NI ELVISmx Oscilloscope Express VI with NI myDAQ Complete the following steps to use the NI ELVISmx Oscilloscope to measure a signal A Note For more information on grounding the signals refer to the Connecting Analog Input Signals section 1 Launch LabVIEW 2 Inthe Getting Started window click Blank VI A blank VI opens Select Window Show Block Diagram to open the VI block diagram Q Tip You can also open the block diagram from the VI front panel by pressing lt Ctrl E gt 3 Right click the block diagram window to open the Functions palette then select Measurement I O NI ELVISmx to open the ELVISmx Express VI palette 4 Select the NI ELVISmx Oscilloscope Express VI from the VI palette and place it on the block diagram The NI ELVISmx Oscilloscope configuration window opens 5 Connect the signal s you want to measure to the connector s on the side of the NI myDAQ device 6 Onthe Configuration tab ofthe configuration window select to measure Channel 0 Channel 1 or both Select the Channel 0 Enable checkbox to measure Channel 0 Select the Channel 1 Enable checkbox to measure Channel 1 Select the Channel 0 Enable and Channel 1 Enable checkboxes to measure both channels 7 necessary click the Auto S
5. seuri v oipny ov av Iv vsa epog 9 oipny edoos iv edoos WING seur1 8 oa seuri v oa seur1 8 seuri v oipny av ov Iv vsa N394 oipny edoos Iv edoos WING eounosed OWGAW N 9 eiger NI myDAQ User Guide ni com 36 Additional Resources The following resources contain information you might find helpful Related Documentation The following documents contain information that you may find helpful as you use this manual NI myDAQ NI myDAQ Specifications This document lists the hardware specifications for your NI myDAQ device NI ELVISmx NI ELVISmx Help This help file contains information about the NI ELVISmx software including information on using NI ELVISmx software instruments and NI ELVISmx Express VIs To access this help file go to Start All Programs National Instruments NI ELVISmx for NI ELVIS amp NI myDAQ NI ELVISmx Help LabVIEW LabVIEW Help tThis help file includes information about LabVIEW programming concepts step by step instructions for using LabVIEW and reference information about LabVIEW VIs functions palettes menus and tools Getting Started with LabVIEW Use this document a
6. 8 Warranty Worldwide Support Services Safety Information A Caution Do not operate the hardware in a manner not specified in this document and in the user documentation Misuse of the hardware can result in a hazard You can compromise the safety protection if the hardware is damaged in any way If the hardware is damaged return it to National Instruments for repair Clean the hardware with a soft nonmetallic brush Make sure that the hardware is completely dry and free from contaminants before returning it to service 2 nicom myDAQ User Guide Electromagnetic Compatibility Guidelines A Cautions To ensure the specified EMC performance e The USB cable must be less than 2 0 m 6 6 ft in length e The length of any wire or cable connected to the 20 pin screw terminal connector must be no longer than 0 3 m 1 ft e length of any wire or cable connected to the Audio or DMM ports must be no longer than 3 m 10 ft This product was tested and complies with the regulatory requirements and limits for electromagnetic compatibility EMC as stated in the product specifications These requirements and limits are designed to provide reasonable protection against harmful interference when the product is operated in its intended operational electromagnetic environment This product is intended for use in residential commercial and industrial locations There is no
7. Note Before opening NI ELVISmx software instrument make sure that the myDAQ device is connected to the system and is ready to use After the myDAQ is connected to the system the blue LED by the connector lights indicating the device is ready for use The NI ELVISmx Instrument Launcher then launches automatically NI ELVISmx provides a collection of software instruments created in LabVIEW and the source code for the instruments You cannot directly modify the executable files but you can modify or enhance the functionality of these instruments by modifying the LabVIEW code which installs in the following location Windows XP 2000 C Documents and Settings All Users Shared Documents NNational Instruments NI ELVISmx Source Code Windows 7 Vista C Users Public Public Documents National Instruments NI ELVISmx Source Code Note For a detailed explanation of the ELVISmx software instruments instructions for taking a measurement with each instrument and information on the other NI ELVISmx Instrument Launcher features refer to the NJ ELVISmx Help To access this help file click the NI ELVISmx Help icon on the Resources tab of the NI ELVISmx Instrument Launcher 16 NImyDAQ User Guide NI ELVISmx Instrument Launcher The NI ELVISmx Instrument Launcher provides access to the NI ELVISmx software instruments additional featured instruments lab exercises documentation and online resource links
8. Regulator 15 V 5 Current TPS61170 g Protection Limiter OE i5v fysus Circuit TPS2553 8 502530202 i5 V m Ap Tees g p 8 gt 7 gt Regulator TE982009 Instrumentation PEAN Amplifier a 10 nme ADC TLE2082 1642 Channel Al 1 412V ADS8319 Multiplexer a AI 1 CEN Regulator atas boss Pb Retos mo Line In R TPS62007 133 y Line In L gt USB STC3 DAC OP AMP DAC8551 OPA1642 AOO 48 3 V Switch BRS cers Y TS12A44514 OP AMP a hd m OPA1642 1 DC DC Digital Isolation pu Isolation Isolator 77777 Barrier Transformer 1807241 Audio AMP Line Out R ome TPA6110A2 ane YF Aes ess Line Out L Y LDO LDO Regulator Regulator Shift TPS71501 TPS76433 Register SN74AHC595 2 MEL m f Isolated 3 3 V Switch TS5A3159 Isolated 5 V hd d Hi HI Lard La Note NI myDAQ components may be changed or substituted without notice Analog Input Al There are two analog input channels on NI myDAQ These channels can be configured either as general purpose high impedance differential voltage input or audio input The analog inputs are multiplexed meaning a single analog to digital converter ADC is used to sample both channels In general purpose mode you can measure up to 10 V signals In audio
9. Voltage Range For Al channels 10 V 2 V For AudioInput channels 2 V Figure 16 NI ELVISmx Dynamic Signal Analyzer 13 Dynamic Signal Analyzer NI ELVISmx E3 Source Channel Voltage Range 10 10 Frequency Span Mode 40000 RMS Resolution lines Weighting 400 Y Exponential Window of Averages None 5 lope Immediate al r Level TRIG Units Mode Averaging dB RMS Restart Scale Maximum Minimum Auto 00 0 000 pe Ez Device Acquisition Mode yevl NI Run Continuously M Run Stop Print Log Help Cursor Selec Posi 22 nicom NImyDAQ User Guide Arbitrary Waveform Generator ARB The NI ELVISmx Arbitrary Waveform Generator ARB generates a signal displayed as an electrical waveform This advanced level software instrument uses the AO capabilities of the device You can create a variety of signal types using the Waveform Editor software which is included with the NI ELVISmx software You can load waveforms created with the NI Waveform Editor into the NI ELVISmx ARB to generate stored waveforms Refer to the NI ELVISmx Help for more information about the Waveform Editor To access this help file go to Start All Programs National Instruments NI ELVISmx for NI ELVIS amp NI myDAQ NI ELVISmx Help Since the device has two AO and two AudioOutput channels two waveforms may be simultaneously gener
10. 6 0 1 20 0m Amplitude D 1 15 0m 20 0m Time gt 1 Run Button NI myDAQ User Guide National Instruments 29 Using NI DAQmx with NI myDAQ NI myDAQ is supported by NI DAQmx and therefore you can program it using the DAQ Assistant Express VI Figure 20 shows the DAQ Assistant Express VI Figure 20 DAQ Assistant Express VI DAQ Assistant Note In NI DAQmx DIO lt 0 7 gt appear as P0 lt 0 7 gt Furthermore you can use NI DAQmx to program some of the available general AI AO and timing functionality of the device Refer to the NJ ELVISmx Help and NI DAQmx Help for more information Note When using NI DAQmx to read the audio channels you must manually change the voltage range to 2 V from the default voltage range of 10 V The 10 V range is not supported by NI DAQmx and will cause an NI DAQmx error but it will not cause the user to receive corrupt data Example Measuring Audio Pass Through in LabVIEW with NI myDAQ This example covers the simultaneous acquisition of input signals and generation of output signals using the DAQ Assistant in LabVIEW This example forms the foundation for audio signal processing experimentation 1 Launch LabVIEW 2 Inthe Getting Started window click Blank VI A blank VI opens Select Window Show Block Diagram to open the VI block diagram 3 Locate the DAQ Assistant Express VI by right clicking the blo
11. 2 Terminal Configuration Click the Add Channels button RSE to add more channels to Custom Scaling the task No Scale v 5 Acquisition Mode Samples to Read Rate Hz Continuous Samples 5k 40000 Click OK to exit the DAQ Assistant configuration front panel The VI builds Click No on the Confirm Auto Loop Creation dialog box that displays Place another DAQ Assistant Express VI to the right of the previously configured DAQ Assistant Express VI on the block diagram The DAQ Assistant Create New Express Task configuration window opens In the DAQ Assistant configuration window select Generate Signals Analog Output and click Voltage to select a Voltage task In the Supported Physical Channels window select audioOutputLeft from under the Devx NI myDAQ option You can also press lt Ctrl gt while clicking audioOutputRight to select both channels Click Finish to exit the Create New Express Task dialog NI myDAQ User Guide National Instruments 31 15 On the Configuration tab of the DAQ Assistant front panel window configure voltage channel 0 by selecting VoltageOut_0 in the Channel Settings pane and setting Max to 2 and Min to 2 in the Signal Output Range pane Repeat this step for voltage channel 1 if you configured the task for two channels 16 Under Timing Settings set Generation Mode to Continuous Samples Configuration Triggering Advanced Timing Deta
12. DIO and Counters Timers section for more information about the counter on NI myDAQ Note The digital I O lines are 3 3 V LVTTL and are tolerant to 5 V inputs The digital output is not compatible with 5 V CMOS logic levels Power Supplies There are three power supplies available for use on NI myDAQ 15 V and 15 V can be used to power analog components such as operational amplifiers and linear regulators 5 V can be used to power digital components such as logic devices The total power available for the power supplies analog outputs and digital outputs is limited to 500 mW typical 100 mW minimum To calculate the total power consumption of the power supplies multiply the output voltage by the load current for each voltage rail and sum them together For digital output power consumption multiply 3 3 V by the load current For analog output power consumption multiply 15 V by the load current Using audio output subtracts 100 mW from the total power budget For example if you use 50 mA on 5 V 2 mA on 15 1 mA on 15 V use four DIO lines to drive LEDs at 3 mA each and have a 1 mA load on each AO channel the total output power consumption is 5 V x 50 mA 250 mW 15 V 2 mA 230 mW 15 V x 1 mA 15 mW 3 3 V x 3 mA x 4 39 6 mW 15 V x 1 mA x 2 30 mW Total output power consumption 250 mW 30 mW 15 mW 39 6 mW 30 mW 364 6 mW Digital Multimeter DMM The NI myDAQ DMM provides the functions for measuri
13. Digital Isolator ISO7241A This is a quad channel digital isolator with multiple channel configurations and output enable functions Shift Register SN74AHC595 This device contains an 8 bit serial in parallel out shift register that feeds an 8 bit D type storage register Switch TS5A3159 This is a single pole double throw SPDT analog switch designed to operate from 1 65 V to 5 5 V Operational Amplifier 171 This is single supply low noise operational amplifier Operational Amplifier TL062C This JFET operational amplifier features high input impedance wide bandwidth high slew rate low input offset and input bias currents ADC ADS8319 This is a 16 bit 500 kS s analog to digital converter DAC DAC8551 This is a small low power voltage output 16 bit digital to analog converter DAC Reference REF3025 This is a precision low power low voltage dropout voltage reference available in a small SOT23 3 34 NI myDAQ User Guide Table 5 Texas Instruments Components in NI myDAQ Continued Texas Instruments Integrated Circuit IC Part Number Description Tristate Buffer SN74AHCTIGI25 This is a single bus buffer gate line driver with three state output Voltage Supervisor TPS3809 This is a supervisory circuit that provides circuit initialization and timing supervision primarily for DSPs and processor based systems Comparator TLV3491 This is a push pull output
14. 7 Connecting Signals 3 5 obere ce ote nen Doni p eee dateien 9 Connecting Analog Input Signals see 10 NI myDAQ DMM Fuse Replacement eere 13 Digital DIO and 15 Using NI myDAQ with NI ELVISmx Software 16 NI ELVISmx Instrument Launcher 17 Digital Multimeter Oscilloscope Scope Function Generator FGEN Bode Analyzer 5 Dynamic Signal Analyzer DSA sese ener 22 Arbitrary Waveform Generator 23 Digital Reader de A Di PEE e E 24 Digital ion tee edge np oiii Eee eade e 25 Example Measuring a Signal Using the NI ELVISmx Oscilloscope with NI myDAQ uu eee eee Using NI myDAQ with LabVIEW NI ELVISmx Express VIs in LabVIEW esee eee emeret 27 Example Measuring Signals Using the NI ELVISmx Oscilloscope Express VI WENI MYDA Q 28 Using NI DAQmx with NI MyDAQ 30 Example Measuring Audio Pass in LabVIEW with NI ad Texas Instruments Components in myDAQ Resource Conflicts Additional Resources obe eee eee deer te re e ie shuts e oie Related Documentation erit Other R sOUfC68 Ree ilia De p ee OP Common Terms and
15. ability to use cursors for accurate screen measurements This instrument has the following measurement parameters e Channel Source Channels AI 0 AI 1 AudioInput Left and AudioInput Right You can use AI channels or AudioInput channels but not a combination of both Coupling AI Channels support DC Coupling only AudioInput Channels support AC Coupling only Scale Volts Div AI channels 5 V 2 V 1 V 500 mV 200 mV 100 mV 50 mV 20 mV 10 mV and for AudioInput Channels 1 V 500 mV 200 mV 100 mV 50 mV 20 mV 10 mV Sample Rate The Max Sample Rate available for AI and AudioInput Channels 200 kS s when either one or both channels are configured Timebase Time Div The available values for both AI and AudioInput channels 200 ms to 5 us Trigger settings Immediate and Edge Trigger Types are supported When using Edge Trigger Type you can specify a Horizontal Position of 0 to 100 Figure 13 NI ELVISmx Oscilloscope 43 Oscilloscope NI ELVISmx t3 i Basic Settings Advanced Settings Source Source AIO 1 7 Enabled enabled Scale Vertical Scale Vertical Volts Div Position Div Volts Div Position Div J iJ 2v of 1v lw of Time Div Type Immediate i M Sms Device Acquisition Mode Devi NI AQ Run Continuously Run Stop Prir Help jc CursorsOn 2 Graph f m er oe Lm er e
16. and functionality to add data and reference files To open the Instrument Launcher navigate to Start All Programs National Instruments NI ELVISmx for NI ELVIS amp NI myDAQ NI ELVISmx Instrument Launcher This opens the suite of NI ELVISmx software instruments Figure 11 NI ELVISmx Instrument Launcher E NI ELVISmx Instrument Launcher Instruments Instruments Favorites A Arbitrary Bode Analyzer Waveform Generator To launch an instrument click the button corresponding to the desired instrument Select the NI myDAQ device from the Device control pull down dialog Some instruments perform similar operations using the same resources of the NI mnyDAQ hardware and therefore cannot run at the same time If you launch two instruments with overlapping functionality that cannot run at the same time the NI ELVISmx software generates an error dialog describing the conflict The instrument with the error is disabled and will not function until the conflict is resolved For information about possible resource conflicts refer to the Resource Conflicts section NI myDAQ User Guide National Instruments 17 Digital Multimeter DMM The NI ELVISmx Digital Multimeter DMM is a stand alone instrument that controls the basic DMM capabilities of NI myDAQ This commonly used instrument can perform the following types of functions Voltage measurement DC and AC Current measurement DC and AC Resistance meas
17. comparator that features a fast 6 us response time and 1 2 pA max nanopower capability allowing operation from 1 8 V 5 5 V Operational Amplifier TLE2082 This is an operational amplifier more than double the bandwidth and triple the slew rate of the TL07x and TLO8x families of BiFET operational amplifiers Operational Amplifier OPA1642 This is a JFET input ultra low distortion low noise operational amplifier fully specified for audio applications Audio Amplifier TPA6110A2 This is a stereo audio power amplifier packaged in an eight pin PowerPAD MSOP package capable of delivering 150 mW of continuous RMS power per channel into 16 Q loads Buffer SN74AUPIG17 This is a low power Schmitt Trigger buffer Switch TS12A44514 This is a low on state resistance quad SPST CMOS analog switch Resource Conflicts Table 6 summarizes the resource conflicts you might encounter if you run certain NI myDAQ circuitry simultaneously To use the information in Table 6 find the instrument you want to use in the left column That row lists all the functions that are resource conflicts If the intersecting box contains an you can use those functions simultaneously without any conflicts NI myDAQ User Guide National Instruments 35 Sjsrxo x jorguoo eornoso1 ON seuri 8 oa seur1 v od seur1 8 Ia
18. mode the two channels represent left and right stereo line level inputs Analog inputs can be measured at up to 200 kS s per channel so they are useful for waveform acquisition Analog inputs are used in the NI ELVISmx Oscilloscope Dynamic Signal Analyzer and Bode Analyzer instruments Analog Output AO There are two analog output channels on NI myDAQ These channels can be configured as either general purpose voltage output or audio output Both channels have a dedicated digital to analog converter DAC so they can update simultaneously In general purpose mode you can generate up to 10 V signals In audio mode the two channels represent left and right stereo outputs Caution fusing earphones to listen to the audio output of the NI myDAQ ensure that the volume is set to a safe level Listening to audio signals at a high volume may result in permanent hearing loss 4 nicom NI myDAQ User Guide Analog outputs can be updated at up to 200 kS s per channel making them useful for waveform generation Analog outputs are used in the NI ELVISmx Function Generator Arbitrary Waveform Generator and Bode Analyzer instruments Digital Input Output DIO There are eight DIO lines on NI myDAQ Each line is a Programmable Function Interface PFI meaning that it can be configured as a general purpose software timed digital input or output or it can act as a special function input or output for a digital counter Refer to Digital I O
19. USER GUIDE NI myDAQ Fran ais Deutsch S30 5 ni com manuals NI myDAQ is a low cost portable data acquisition DAQ device that uses NI LabVIEW based software instruments allowing students to measure and analyze real world signals NImyDAQ is ideal for exploring electronics and taking sensor measurements Combined with NI LabVIEW on the PC students can analyze and process acquired signals and control simple processes anytime anywhere Figure 1 NI myDAQ JW Nationa INSTRUMENTS Contents Safety Information sese Electromagnetic Compatibility Guidelines NI myDAQ Hardware Overview esee Analog Input isnt Analog Output teles tent ea ie eds ka p ema cien Ae aes Digital Input Output Power Supplies 5 Digital Multimeter DMM 5 myDAQ Software Overview 6 NI ELVISmx Driver Software NI LabVIEW and NI ELVISmx Express VIs s NI myDAQ and NI Mu ltisim n tarte ete E PEDE 6 Getting 6 NATIONAL gt INSTRUMENTS Making Signal Connections with NI 0 7 Setting up Your NI myDAQ
20. als configured as a counter is used for counter timer pulse width measuring and quadrature encoding applications When using the counter timer the Source is accessed through DIO 0 the Gate through DIO 1 the Auxiliary Input through DIO 2 the Output through DIO 3 and the Frequency Output through DIO 4 When using the counter timer as a quadrature encoder A Z and B correspond to DIO 0 DIO 1 and DIO 2 respectively In some instances the software may refer to the output lines as PFI as opposed to DIO Refer to Table 3 for a list of the corresponding counter timer signals assignments through the DIO terminals Table 3 NI myDAQ Counter Timer Signal Assignments Programmable NI myDAQ Function Interface Counter Timer Quadrature Encoder Signal PFI Signal Signal DIO 0 PFI 0 CTR 0 SOURCE A DIO 1 PFI 1 CTR 0 GATE Z DIO 2 PFI 2 CTR 0 AUX B DIO 3 PFI3 CTR 0 OUT DIO 4 PFI 4 FREQ OUT Pulse width modulation PWM pulse train measurements are generated through DIO 3 For more information about event timing requirements refer to the NJ myDAQ Specifications document For more detailed information on using counter timers with NI myDAQ refer to the KnowledgeBase document How Do I Use the NI myDAQ Counter To access this document goto ni com info and enter the Info Code mydaqcounter NI myDAQ User Guide National Instruments 15 Using NI myDAQ with NI ELVISmx Software Instruments
21. ated You can choose to run continuously or run once This instrument has the following measurement parameters Output Channels AO 0 and AO 1 AudioOutput Left and AudioOutput Right You can use AO channels or AudioOutput channels but not a combination of both Trigger Source Immediate only This control will always be disabled Figure 17 NI ELVISmx Arbitrary Waveform Generator 43 Arbitrary Waveform Generator NI ELVISmx ka HE Output Channel Waveform Name Gain 400 v Enabled 2 square1000 wdt i crear 1 00 Aol v Enabled 1Vsine1000 wdt i crear 1 0 Update Rate 1 0k 25 5 Click to Launch Device Generation Mode Run Stop Help Devi NI Run Continuously se EP 9 lt gt NI myDAQ User Guide National Instruments Digital Reader The NI ELVISmx Digital Reader reads digital data from the NI myDAQ digital lines NI ELVISmx Digital Reader groups the I O lines into ports through which data can be read You can read one port at a time either continuously or as a single reading The lines are grouped into two ports of four pins 0 to 3 and 4 to 7 or one port of eight pins 0 to 7 Figure 18 NI ELVISmx Digital Reader Joe Digital Reader NI ELVISmx Lines to Read 4 7 v 24 ni com Device Acquisition Mode Dev3 NI Run Continuously v Run Stop Help e
22. ck diagram window and selecting Measurement I O NI DAQmx DAQ Assist from the Functions palette 4 Place the DAQ Assistant Express VI on the block diagram The DAQ Assistant Create New Express Task configuration window opens Q Tip You can also use the Quick Drop dialog box to locate the DAQ Assistant Express VI Select View Quick Drop or press the lt Ctrl Space gt keys to display this dialog box 5 Inthe DAQ Assistant configuration window select Acquire Signals Analog Input and click Voltage to select a Voltage task 6 IntheSupported Physical Channels window select audioInputLeft from under the Devx NI myDAQ option You can also press Ctrl while clicking audioInputRight to select both channels 30 NI myDAQ User Guide Click Finish to exit the Create New Express Task dialog On the Configuration tab of the DAQ Assistant front panel window configure voltage channel 0 by selecting Voltage_0 in the Channel Settings pane and setting Max to 2 and Min to 2 in the Signal Input Range pane Repeat this step for voltage channel 1 if you configured the task for two channels Under Timing Settings set Acquisition Mode to Continuous Samples Enter 5000 in Samples to Read and 40000 in Rate Hz 10 11 12 13 14 Configuration Triggering Advanced Timing Logging X Details gt gt j Voltage Input Setup Voltage 0 Settings Voltage 1 Max 2 Volts Min
23. ctor lights indicating the device is ready for use 1 Connect the signal s you want to measure to the connector s on the side of the NI myDAQ device 2 Launch the NI ELVISmx Scope from the NI ELVISmx Instrument Launcher Click Run You should see the signal in the Display Window 4 Ifnecessary adjust the controls to stabilize the signal in the graph Adjust the Time Div Vertical Position Scale and other controls as desired 26 NI myDAQ User Guide Using NI myDAQ with LabVIEW This section provides an overview of using NI myDAQ with LabVIEW NI ELVISmx Express Vis in LabVIEW With NI ELVISmx the NI myDAQ instruments have an associated LabVIEW Express VI Express VIs allow you to interactively configure the settings for each instrument This enables you to develop LabVIEW applications without extensive programming expertise To access the NI ELVISmx Express VIs open a LabVIEW block diagram and select Measurement I O NI ELVISmx from the function palette Table 4 shows the available NI ELVISmx Express VIs Refer to the NJ ELVISmx Help for more information To access this help file go to Start All Programs National Instruments NI ELVISmx for NI ELVIS amp NI myDAQ NI ELVISmx Help Table 4 NI ELVISmx Express VIs for NI myDAQ NI ELVISmx Express VI i J NI ELVISmx Arbitrary NI ELVISmx Bode NI ELVISmx NI ELVISmx Waveform Analyzer Digital Reader Digital Writer Generator
24. d logarithmic display scales You can also invert the measured values of the input signal during Bode analysis by inverting the Op Amp signal polarity Refer to the NJ ELVISmx Help for required hardware connections To access this help file go to Start All Programs National Instruments NI ELVISmx for NI ELVIS amp NI myDAQ NI ELVISmx Help This instrument has the following measurement parameters Stimulus measurement channel AI 0 Response measurement channel AI 1 Stimulus signal source AO 0 Frequency range 1 Hz to 20 kHz Figure 15 NI ELVISmx Bode Analyzer 13 Bode Analyzer HI ELVISmx la E3 Start Frequency 10 00 Hz Stop Frequency 2 50k 9 Hz Steps 5 per decade Op Amp Peak Amplitude Signal Polarity 2 00 Normal s Mapping Logarithmic e v Autoscale Cursors On Position ursor Real Device Devi NI myDAQ Stop Print Log Help L eJ ele NI myDAQ User Guide National Instruments 21 Dynamic Signal Analyzer DSA The NI ELVISmx Dynamic Signal Analyzer DSA performs a frequency domain transform of the AI or Audio Input waveform measurement It can either continuously make measurements or make a single scan You can also apply various window and filtering options to the signal This instrument has the following measurement parameters Source Channel AI 0 and AI 1 AudioInput Left and AudioInput Right
25. e grounded source Figure 6 Ground Referenced Differential Connection Signal Source Al Floating Signal Sources A floating signal source is not connected to the same ground reference as NI myDAQ but instead has an isolated reference point Some examples of floating signal sources are battery powered devices outputs of transformers thermocouples optical isolator outputs and isolation amplifiers An instrument or device that has an isolated output is a floating signal source You must connect the ground reference of floating signal to an NI myDAQ AGND pin through a bias resistor or jumper wire to establish a local or onboard reference for the signal Otherwise the measured input signal varies as the source floats out of the common mode input range The easiest way to reference the source to AGND is to connect the positive side of the signal to and connect the negative side of the signal to AGND as well as to AI without using resistors This connection works well for DC coupled sources with low source impedance less than 100 Q Figure 7 Differential Connections for Floating Signal Sources without Resistors Signal Source Al Al Rsource gt 100 Q For larger source impedances however this connection leaves the differential signal path significantly off balance Noise that couples electrostatically onto the positive line does not cou
26. ence for all DMM measurements HI A COM Input Positive terminal for current measurements Fused F 1 25 A 250 V Fast Acting Connecting Analog Input Signals When configuring the input channels and making signal connections you must first determine whether the signal sources are floating or ground referenced The following sections describe these two signal types Ground Referenced Signal Sources A ground referenced signal source is connected to the building system ground so it is already connected to a common ground point with respect to the NI myDAQ device assuming that the computer is plugged into the same power system Instruments or devices with nonisolated outputs that plug into the building power system are ground referenced signal sources Note Most laptop computers have isolated power supplies and are consequently not connected to the building ground system In these cases treat the analog input signal as floating with respect to NI myDAQ 10 nicom NI myDAQ User Guide The difference in ground potential between two instruments connected to the same building power system is typically between 1 and 100 mV This difference can be much higher if power distribution circuits are improperly connected If a grounded signal source is improperly measured this difference might appear as a measurement error Connect the differential analog inputs across the signal source and do not connect the NI myDAQ AGND pin to th
27. etup button to automatically configure the oscilloscope parameters to acquire the signal or explicitly set the Sample Rate and Record Length You can also configure the measurement to acquire N samples or acquire Continuously If necessary adjust the controls to stabilize the signal in the graph p Configuration Trigger Settings Advanced Configurati Device Channel Channel 1 Dev3 NI myDAQ Source Sample Rate 5 5 Channel 0 Enable AIO 100k Channel 1 Enable Range V Coupling Record length 5 DC 2k Auto Setup Probe Acquire 1x N Samples v 8 Click OK on the configuration window front panel 28 nicom NI myDAQ User Guide 9 On the block diagram right click the Channel 0 output terminal and select Create Graph Indicator from the menu This creates a Graph Indicator on the VI front panel to display the signal data Repeat this step for Channel 1 if you configured the NI ELVISmx Oscilloscope Express VI to enable Channel 1 myDAO Channel 0 ELVISmx Oscilloscope 10 Click the Run button to begin acquiring the measurement You should see the signal s in the graphs on the VI front panel T3 Untitled 1 Front Panel Jog File Edit Yiew Project Operate Tools Window Help m O PDR 13pt Application Font 1 tar 6 1 21 Channel 0 Out cho 6 0 Amplitude 6 0 1 0 0 10 0m 15 0 Channel 1 Out cen
28. g digital signal processing steps such as filters between the input and output NI myDAQ User Guide National Instruments 33 Texas Instruments Components in NI myDAQ Integrated circuits supplied by Texas Instruments form the power and analog I O subsystems of NI myDAQ Figure 2 depicts the arrangement and function of the NI myDAQ subsystems Table 5 lists all of the Texas Instruments components used in NI myDAQ Visit www ti com to see the specifications documents for each of the components in the design Table 5 Texas Instruments Components in NI myDAQ Texas Instruments Integrated Circuit IC Part Number Description Current Limited TPS2553 This is used for applications where precision current Power Distribution limiting is required or heavy capacitive loads and short Switch circuits are encountered Regulator TPS61170 This is a monolithic high voltage boost regulator with an integrated 1 2 A 40 V power MOSFET Regulator TPS62007 The TPS6200x devices are a family of low noise synchronous step down DC DC converter that is Regulator TPS62003 ideally suited for systems powered from a one cell Li ion battery or from a two to three cell NiCd NiMH or alkaline battery LDO Regulator TPS71501 These are low dropout LDO voltage regulators offering the benefits of low noise low dropout LDO Regulator TPS76433 voltage low power operation and miniaturized packages
29. guarantee that harmful interference will not occur in a particular installation or when the product is connected to a test object To minimize the potential for the product to cause interference to radio and television reception or to experience unacceptable performance degradation install and use this product in strict accordance with the instructions in the product documentation Furthermore any changes or modifications to the product not expressly approved by National Instruments could void your authority to operate it under your local regulatory rules NI myDAQ Hardware Overview NI myDAQ provides analog input AI analog output AO digital input and output DIO audio power supplies and digital multimeter DMM functions in a compact USB device Q Tip The Common Terms and Acronyms section has a list of acronyms and terms that you will see in this manual and in many engineering and measurement documents and websites Integrated circuits supplied by Texas Instruments form the power and analog I O subsystems of NI myDAQ Figure 2 depicts the arrangement and function of the NI myDAQ subsystems Refer to Table 5 for more information on all ofthe Texas Instruments components used in NI myDAQ NI myDAQ User Guide National Instruments 3 Figure 2 NI myDAQ Hardware Block Diagram
30. i com mydag Contains product information support information and helpful links to tutorials examples curriculum videos and more e ni com 1vi01 Contains learning modules for basic Core LabVIEW Concepts hardware connections and other measurement and analysis tasks Common Terms and Acronyms Table 7 lists some commonly used acronyms in data acquisition and measurement Table 7 Commonly Used Acronyms Acronym Definition Description ADC Analog to digital Device that converts analog signals into digital converter data AI AO Analog input analog A continuous signal that conveys data from output physical phenomena such as temperature strain pressure sound or light DAC Digital to analog Device that converts digital code into analog converter signals DAQ Data acquisition Measuring an electrical or physical phenomenon such as voltage current or temperature using a combination of hardware and software DIO Digital input output A non continuous signal that conveys data in digits or pulses that can be logged as digital data or converted into an analog signal for viewing GND Ground The ground or earth reference in a circuit MIO Multifunction The collective term for multiple measurements input output types such as AI AO DIO GND and power signals PFI Programmable Function A signal that can be configured for different uses Interface such as a digital input a digita
31. ils Voltage Output Setup VoltageOut 0 Settings VoltageOut 1 Max 2 Volts Min 2 Terminal Configuration s Click the Add Channels button lt Let NEDAQ Choose gt igi gt to add more channels to Custom Scaling thetask No Scale v Generation Mode Samples to Write Rate Hz Continuous Samples v 100 1k 17 Click OK to exit the DAQ Assistant configuration front panel The VI builds Click No on the Confirm Auto Loop Creation dialog box that displays 18 Wire the data output terminal of the first DAQ Assistant Express VI to the data input terminal of the second DAQ Assistant Express VI 19 Adda While Loop to the block diagram by right clicking the block diagram window and selecting Programming Structures While Loop from the Functions palette and drag out a rectangular region to enclose both DAQ Assistant Express VIs 32 nicom NI myDAQ User Guide 20 Adda STOP control to your front panel by right clicking the STOP button and selecting Create Control 21 Click the Run button to test your LabVIEW application 22 Attach a music player to the AUDIO IN 3 5 mm jack and connect speakers to the AUDIO OUT jack You should hear the music on the speakers If you do not hear sound test the speakers on the music player to make sure there is sound playing and that the speakers are functioning properly This example provides the basis for audio measurement Experiment further by placin
32. im You can use NI ELVISmx instruments in NI Multisim to simulate a circuit measure the real signals with NI myDAQ and compare simulated and acquired data To see step by step instructions for using NI ELVISmx instruments in NI Multisim refer to Using NI ELVISmx in NI Multisim help file installed with NI ELVISmx To access this help file go to Start All Programs National Instruments NI ELVISmx for NI ELVIS amp NI myDAQ Using NI ELVISmx in NI Multisim Getting Started Getting started with NI myDAQ is a simple process but it is important to ensure that you install the right components in the correct order To get started with your NI myDAQ complete the following steps 1 Install the NI myDAQ Software Suite from the DVD shipped with your device The NI myDAQ Software Suite installs application software NI LabVIEW NI Multisim first and then installs the NI ELVISmx driver software Note Ifyou are not installing software from the NI myDAQ Software Suite media make sure to install all application software before installing the driver software 6 NI myDAQ User Guide 2 Connect the cable from the computer Hi Speed USB port to the USB port on the device The computer will recognize the NI myDAQ and the NI ELVISmx Instrument Launcher appears You can also manually open NI ELVISmx Instrument Launcher by selecting Start All Programs National Instruments NI ELVISmx for NI ELVIS amp NI myDAQ NI ELVISmx Instr
33. l output a timing input or a timing output VI Virtual Instrument A software program and hardware device that work together to create a user defined measurement system 38 nicom NImyDAQ User Guide Warranty For customers other than private individual users in the EU The NI myDAQ is warranted against defects in materials and workmanship for a period of one year from the date of shipment as evidenced by receipts or other documentation National Instruments will at its option repair or replace equipment that proves to be defective during the warranty period This warranty includes parts and labor For private individual users in the EU Based on your statutory rights National Instruments will through its distributor cure defects in materials and workmanship within two years from delivery For support visit the Worldwide Offices section of ni com niglobal to access the branch office websites which provide up to date distributor contact information Worldwide Support and Services The National Instruments website is your complete resource for technical support At ni com support you have access to everything from troubleshooting and application development self help resources to email and phone assistance from NI Application Engineers Visit ni com services for NI Factory Installation Services repairs extended warranty and other services Visit com register to register your National Instruments product P
34. ng voltage DC and AC current DC and AC resistance and diode voltage drop DMM measurements are software timed so update rates are affected by the load on the computer and USB activity NI myDAQ User Guide National Instruments 5 NI myDAQ Software Overview NI ELVISmx Driver Software NI ELVISmx is the driver software that supports NI myDAQ NI ELVISmx uses LabVIEW based software instruments to control the NI myDAQ device providing the functionality of a suite of common laboratory instruments Refer to the Using NI myDAQ with NI ELVISmx Software Instruments section for information on the NI ELVISmx suite of measurement instruments NI ELVISmx is located on your driver software installation media included in the NI myDAQ kit or can be found by searching for ELVISmx on the Drivers and Updates page at ni com drivers To determine the version of NI ELVISmx software support required for your version of LabVIEW go to ni com info and enter the Info Code exsbw6 NI LabVIEW and NI ELVISmx Express VIs Also installed with NI ELVISmx are the LabVIEW Express VIs which use NI ELVISmx software instruments to program NI myDAQ with more enhanced functionality For more information on the NI ELVISmx Express VIs refer to the Using NI myDAQ with LabVIEW section Note NI ELVISmx supports LabVIEW 32 bit To use NI ELVISmx with LabVIEW on a 64 bit operating system you must have LabVIEW 32 bit installed NI myDAQ and NI Multis
35. ple onto the negative line because it is connected to ground This noise appears as a differential mode signal instead of a common mode signal and thus appears in your data In this case instead of directly connecting the negative line to AGND connect the negative line to AGND through a resistor that is about 100 times the equivalent source impedance The resistor puts the signal path nearly in balance so that about the same amount of noise couples onto both NI myDAQ User Guide National Instruments 11 connections yielding better rejection of electrostatically coupled noise This configuration does not load down the source Figure 8 Differential Connections for Floating Signal Sources with a Single Resistor Signal Source Rsource gt 100 You can fully balance the signal path by connecting another resistor of the same value between the positive input and AGND as shown in Figure 9 This fully balanced configuration offers slightly better noise rejection but has the disadvantage of loading the source down with the series combination sum of the two resistors If for example the source impedance is 2 kO and each of the two resistors is 100 kQ the resistors load down the source with 200 kQ and produce a 1 gain error Figure 9 Differential Connections for Floating Signal Sources with Two Resistors Signal Source Al Al 2100 E
36. roduct registration facilitates technical support and ensures that you receive important information updates from NI National Instruments corporate headquarters is located at 11500 North Mopac Expressway Austin Texas 78759 3504 National Instruments also has offices located around the world For telephone support in the United States create your service request at ni com support or dial 1 866 ASK MYNI 275 6964 For telephone support outside the United States visit the Worldwide Offices section of ni com niglobal to access the branch office websites which provide up to date contact information support phone numbers email addresses and current events Refer to the M Trademarks and Logo Guidelines at ni com trademarks for more information on National Instruments trademarks Other product and company names mentioned herein are trademarks or trade names of their respective companies For patents covering National Instruments products technology refer to the appropriate location Help Patents in your software the patents txt file on your media or the National Instruments Patents Notice at ni com patents You can find information about end user license agreements EULAs and third party legal notices in the readme file for your NI product Refer to the Export Compliance Information at ni com 1egal export compliance for the National Instruments global trade compliance policy and how to obtain relevant HTS codes ECCNs and other import e
37. s a tutorial to familiarize yourself with the LabVIEW graphical programming environment and the basic LabVIEW features you use to build data acquisition and instrument control applications This document contains exercises that you can use to learn how to develop basic applications in LabVIEW Multisim Getting Started with NI Circuit Design Suite Follow the tutorial in Chapter 2 of this manual to familiarize yourself with the basics of Multisim Multisim Help File This help file describes Multisim and its functions It is organized based on the stages of circuit design and explains all aspects of Multisim in detail This help file also provides detailed information about using NI ELVISmx instruments in Multisim The NI ELVISmx information is also found in the Multisim for Education manual Using NI ELVISmx Instruments in NI Multisim This help file contains tutorials and information on using NI ELVISmx instruments in NI Multisim to simulate data acquire data from hardware and compare simulated and acquired data To access this help file select Start All Programs National Instruments NI ELVISmx for NI ELVIS amp NI myDAQ Using NI ELVISmx Instruments in NI Multisim NI DAQmx NI DAQmx Help This help file explains key NI DAQmx concepts describes how to create common applications and details device specific information needed to use NI DAQmx NI myDAQ User Guide National Instruments 37 Other Resources n
38. ument Launcher Caution To ensure the specified EMC performance the USB cable must be less than 2 0 m 6 6 ft in length Making Signal Connections with NI myDAQ Setting up Your NI myDAQ Device A Caution Insert and remove the 20 position screw terminal connector aligned evenly to the NI myDAQ Inserting the screw terminal connector at an angle to the NI myDAQ may cause damage to the connector The screw terminal connector must snap securely into place to ensure proper signal connection NI myDAQ User Guide National Instruments 7 Figure 3 NI myDAQ Connection Diagram NA 1 NI myDAQ 4 20 Screw Terminal Connector 2 USB Cable 5 Audio Cable 3 LED 6 DMM Banana Cable 8 NI myDAQ User Guide Connecting Signals Figure 4 shows the available audio AI AO DIO GND and power signals accessed through the 3 5 mm audio jacks and screw terminal connections Refer to Table 1 for descriptions of these signals A Cautions Signal wires must be securely affixed and screwed down in the screw terminal connector to ensure proper connection To ensure the specified EMC performance The length of any wire or cable connected to the 20 pin screw terminal connector must be no longer than 0 3 m 1 ft The length of any wire or cable connected to the Audio or DMM ports must be no longer than 3 m 10 ft Figure 4 NI myDAQ 20 Position Scre
39. urement Diode test Audible continuity test Make connections for measurements to the DMM banana jacks on the device This instrument has the following measurement parameters DC voltage 60 V 20 V 2 V and 200 mV ranges AC voltage 20 V 2 V and 200 mV ranges DC current 1 A 200 mA and 20 mA ranges AC current 1 A 200 mA and 20 mA ranges Resistance 20 MQ 2 MQ 200 kQ 20 kQ 2 kQ and 200 Q ranges Diode 2 V range Resolution number of significant digits for display 3 5 Figure 12 NI ELVISmx Digital Multimeter 18 13 Digital Multimeter NI ELVISmx m E3 ve v a A a 4 9 Mode Banana Jack Connections Specify Range Range Y HI COM HI Null Offset Device Acquisition Mode Dev3 NI Run Continuously a Run Stop Help L9 e ni com NI myDAQ User Guide Oscilloscope Scope The NI ELVISmx Oscilloscope Scope displays voltage data for analysis This instrument provides the functionality of the standard desktop oscilloscope found in typical undergraduate laboratories The NI ELVISmx Oscilloscope has two channels and provides scaling and position adjustment knobs along with a modifiable timebase The autoscale feature allows you to adjust the voltage display scale based on the peak to peak voltage of the AC signal for the best display of the signal The computer based scope display has the
40. w Terminal I O Connector IN Table 1 Screw Terminal Signal Descriptions Signal Name Reference Direction Description AUDIO IN Input Audio Input Left and right audio inputs on a stereo connector AUDIO OUT Output Audio Output Left and right audio outputs on a stereo connector 15V 15V AGND Output 15 V 15 V power supplies AGND Analog Ground Reference terminal for AI AO 15 V and 15 V AO 0 AO 1 AGND Output Analog Output Channels 0 and 1 AI 0 AI 0 AGND Input Analog Input Channels 0 and 1 AI 1 AT 1 DIO lt 0 7 gt DGND Input or Digital I O Signals General purpose Output digital lines or counter signals DGND Digital Ground Reference for the DIO lines and the 5 V supply 5V DGND Output 5 V power supply NI myDAQ User Guide National Instruments 9 Figure 5 shows the DMM connections on the NI myDAQ Table 2 describes these signals A Caution 60 VDC 20 Vrms maximum Do not plug digital multimeter probes into circuits with Hazardous Voltages such as wall outlets Figure 5 Connections for DMM Measurements Li 1 Connectors for Voltage Resistance Diode Continuity 2 Connectors for Current Table 2 DMM Signal Descriptions Signal Name Reference Direction Description HI COM Input Positive terminal for voltage resistance and diode measurements COM Refer
41. wn the display will show Over indicating a disconnected circuit path Replace the fuse and complete the procedure again Replacing the Fuse Replace broken fuses with a 1 25 A Fast Acting sand filled 5 x 20 mm fuse Littelfuse part number 02161 25 at www littelfuse com To replace a broken fuse complete the following steps 1 Power down the device by properly disconnecting it from the PC and removing the USB cable Remove the screw terminal connector and all other signal cables from the device Loosen the four Phillips screws that attach the bottom of the enclosure to the device and remove the top lid of the enclosure Caution Do not remove the board from the bottom half of the NI myDAQ enclosure NI myDAQ User Guide National Instruments 13 4 Replace the broken fuse while referring to Figure 10 for the fuse location taking care to not damage any components on the board Figure 10 NI myDAQ Fuse Location PES 0 JExas INSTRUMENTS 1 Enclosure Screws 2 Internal Fuse 1 25 A Fast Acting Littelfuse Part Number 02161 25 5 Replace the lid and screws 14 nicom NI myDAQ User Guide Digital DIO and Counters Timers There are eight software timed DIO lines on the NI myDAQ that can be individually configured for input or output Additionally lines DIO lt 0 4 gt can be configured for counter timer functionality The input accessed through DIO 0 DIO 1 and DIO 2 sign
42. xport data NI MAKES NO EXPRESS OR IMPLIED WARRANTIES AS TO THE ACCURACY OF THE INFORMATION CONTAINED HEREIN AND SHALL NOT BE LIABLE FOR ANY ERRORS U S Government Customers The data contained in this manual was developed at private expense and is subject to the applicable limited rights and restricted data rights as set forth in FAR 52 227 14 DFAR 252 227 7014 and DFAR 252 227 7015 2010 2014 National Instruments All rights reserved 373060F 01 Aug14
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